【单选题】【消耗次数：1】
在实际使用的 IP地址中,主机号不能为全“0”和全“1”,那么一个C类IP地址,最多能容纳的主机数目为( )
①
A、64516
②
B、254
③
C、64518
④
D、256
参考答案：
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